"The desire to try something new" 7PRC vs Traditional Cartridges.

"The desire to try something new" 

7PRC vs Traditional Cartridges

 

In 2025 I spent some time working with my brother on some of the interests he had and wanted to share some information with everybody reading.  It's interesting all the information you can find about the shooting sports and all the new things out on the market.  Lots of people jumping on the bandwagon and a lot of critics.  So, this is just a second hand look at the experiences and learning curve that comes with the understanding of these things and the Journey.  "The Journey is the best part!"

JRS

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My Journey to the Bergara B14 Hunter in 7PRC

For as long as I can remember, hunting has been a family tradition built around one chambering: the .30‑06. My dad and my two younger brothers all hunted with .30‑caliber rifles, all of us shooting the same reliable load, Hand Loads my father developed, 165‑grain Hornady InterLock bullets. It wasn’t just a cartridge; it was part of our identity.

My own journey began with a 1974 Remington 700 ADL in .30‑06, the rifle my father bought the week I was born. I carried it through many seasons before stepping up to the Browning BBR my dad had used for years. Both rifles I shot very well, harvested many animals and probably still have continued but there was a desire to be able to shoot flatter and longer, it was like an itch I needed to scratch...

Eventually, I stepped into magnum territory with a Savage 111 in .300 Win Mag. Now along with the help of my brother launching 178‑grain ELD-X handloads, this rifle hit hard and stretched my effective range. My brother took things even further for me by adding a new stock and muzzle brake. I could now start to see the difference in my accuracy. This stirred up a curiosity I’d been suppressing for years: the desire to try something new.

I scratched that itch with a 6.5 PRC, harvesting two white tails cleanly. This cartridge opened my eyes...And while I was still on this journey of discovery, it was the newly released 7 PRC that really grabbed my attention.

As luck would have it, I found one on sale:

Bergara B14 Hunter — 7mm PRC

·         22-inch fluted and threaded barrel

·         Factory stock

·         No scope include

I started with what I had available: a SIG Buckmaster 4-12x44 second focal plane, for under $150. I paired it with a 20 MOA rail and medium rings: all sourced from Amazon. With factory Hornady ammo, I saw 1.75–1.25 MOA. Not terrible — but not what I wanted.

Then I borrowed a Bell & Carlson stock from my brother. Immediately my groups tightened to 1 MOA. That pushed me to upgrade the glass, replacing the Buckmasters with a SIG Whiskey 4 FFP (4–20x50) and Talley one‑piece low rings. That combination shrunk my groups to 0.90 MOA.

Finally, came load development. Working alongside my brother, we dialed in a 175-grain ELD-X, achieving 2915 fps from the 22-inch barrel. The results? Consistent 0.75-inch groups.

I have now replaced the Scope with Vortex and the Stock with an AG Composite Carbon Fiber stock and can achieve 0.5-inch groups

This journey wasn’t just about buying a new rifle — it was about learning. I improved my shooting fundamentals, diagnosed shooter‑induced errors more clearly, and built confidence in reading group behavior. The 7 PRC didn’t just expand my caliber; it expanded my capabilities.

DTS - "High Desert Hill Billys" 

Postscript:

The time spent on the range with my brother and sons has now become my new pass time.  "Golf with lead and dust".  The journey is still on going, I have more to do with this rifle build, and the 7 PRC.

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What is your favorite cartridge?  Is it new or old, something different, or what you have used for years?

 Thanks for reading,

JRS

 

2022 Hunting Season

Hunting 2022 Click link to watch video

Guess where? 22/10/19

 

2010 B&C Official Score RM Elk 313 6/8" Net - 322 6/8" Gross

My Dad tagged this Elk the last weekend of the season 2010.  I will add more pictures as I find them.

Totally boned out it took 3days to pack him out and we lost a ATV in the process.

Shotgun Choke Tubes

I’m not going to pretend that I know what I am talking about on this, So I added some info from the web site listed attached.

ShotgunLife.com - Choke Tubes

Shotgun Chokes

Count yourself lucky that some genius invented the screw-in shotgun choke. Otherwise, you’d probably need five shotguns.

Adjustable shotgun chokes give you the ability to change the pattern of your shot by tailoring the constriction. The baseline constriction is cylinder -- or the inner diameter of your barrel. From there, the designations grow tighter.

Choke Bore Sizes and Constrictions

	CYL	LTSK	SK	IMK	IC	LM	M	IM	LF	F	XF	D
12 Bore	.000	N/A	.005	N/A	.010	.015	.020	.025	.030	.035	.040	.005 and Rifled!
20 Bore	.000	.003	.005	.007	.009	.012	.015	.018	.021	.024	.027	.005 and Rifled!
28 Bore	.000	.003	.005	.007	.009	.012	.015	.018	.021	.024	.027	N/A
.410 Bore	.000	.003	.005	.007	.008	.010	.012	.014	.016	.018	.020	N/A

(Courtesy of Briley Mfg.)

*Abbreviations:
CYL = Cylinder
LTSK = Light Skeet
SK = Skeet
IMK = Improved Skeet
IC = Improved Cylinder
LM = Light Modified
M = Modified
IM = Improved Modified
LF = Light Full
F = Full
XF = Extra Full
D = Diffusion
N/A = Not Applicable

Looking at the chart, you’ll see that SK (skeet) imposes a .005% constriction compared to cylinder. Full gives you a .035% constriction. Yes, that’s a 600% difference.

Percentage of Constriction Based on Distance
Choke	20 Yards	30 Yards	40 Yards
Cylinder	80%	60%	40%
Skeet	92%	72%	50%
Improved Cylinder	100%	77%	55%
Modified	100%	83%	60%
Improved Modified	100%	91%	65%
Full	100%	100%	70%

In this chart, you’ll notice that as the choke grows tighter (from cylinder to full) the density of the pattern increases based on distance.

That’s because tight chokes distribute the shot in a tight, dense pattern best for long shots. Open chokes give you a wider, diffused pattern intended for close shots.

If this sounds counter-intuitive, here’s the way it works.

You may be thinking that you want the wider pattern for longer shots because the target is further away. The longer the distance, logic dictates the wider the pattern giving you a better chance to hit the target.

But what you’re not taking into account are the laws of physics.

Smaller shot (which tends to be used for close shots of 16-20 yards) lacks the energy (momentum) to give you accuracy at longer range. The shot spreads willy-nilly and you lose accuracy.

So if you’re going for a long shot, you want to use a bigger pellet in a tighter shot string for an arrow-head effect. Hence, a tighter choke.

For close-range shots, as in skeet, physics dictates that the more pellets you shoot the greater the odds for hitting the target before the smaller (lighter) pellets lose their momentum. So you want to go for a wider choke that lets the smaller, lighter pellets actually swarm around the target while they’re still effective.

Basically, there are three types of chokes.

The fixed choke is already machined into the barrel of the shotgun. You’ll see guns that are designated with skeet chokes, or full and improved cylinder chokes for wingshooting. The type of chokes depends on its specialized use, and will often be accompanied by stock and sight complements.

When you buy a new shotgun, it will include a few screw-in chokes most appropriate for its design. You usually can purchase after-market chokes to fill out your inventory.

Screw in chokes come in two varieties: extended and flush mounted.

Extended chokes protrude above the muzzle and are generally clearly marked; they are designed to be screwed in by hand.

Flush-mounted chokes are screwed entirely into the barrel so that in the end the choke is flush with the muzzle. Newer flush-mounted chokes tend to also be clearly identified. But less expensive or older flush-mounted chokes rely on a notch system to identify their constriction.

Choke	Notches
Cylinder	/////
Skeet	/////
Improved Cylinder	////
Modified	///
Improved Modified	//
Full	/

Then there’s the adjustable choke. This is a single choke with multiple settings. Turn the selector to set the most appropriate constriction.

Once you have the choke installed, it’s best to pattern it on paper.

You’ll need a pattern target and something disposable to mount it on.

Typically, you’d want to be about 40 yards from your “pattern board.” Draw a 30-inch circle around the center of the pattern and then count the pellets as a means to determine the accuracy of your choke. A full choke should put 70% of its pellets in a 30" circle at 40 yards. A modified choke should put 60% of its pellets in the circle. And an improved cylinder should give you 50%.

Perhaps the biggest risk with chokes is that they become a crutch.

For example, if you consistently missed the #3 station on skeet with a skeet choke, moving to a wider cylinder choke probably won’t help. After all, if you’re on the target, you’re on it. The same can be said of most other clays sports.

Missing shots is generally not a function of your choke selection. It’s a function of your skill, technique and body mechanics.

The worst mistake you can make with a choke is using it as an excuse for missed shots.

If you have a problem station, and you’re using the recommended choke, the best thing you can do is practice, practice, practice.

My thoughts:

I'm thinking in the same direction of the last paragraph above.  Practice and time in the field is going to improve your ability’s.  If you worry too much about all of this it changes the game and you might as well take up golf.  Use what works for you!!! and keep in mind that some experimenting can make big improvements to your understanding of why you missed.  Keep in mind also, that you have to take into account the type of powder, wad, and shot that you are using.  However, you don't have time to change chokes and shells as the birds are flying away.  Some of the best practice you can get is at a Sports Clay range.  Take a month of weekends and try it out, it’s a lot of fun and your wife will enjoy making a date out of it.  Or( my preference) you can take a trip to "Lake in the Dunes" and do it all. 

http://www.lakeinthedunes.com/

http://thegrindstonelakes.com/

Some more charts: