Home Forums Hunting & Shooting Custom Rifles & Wildcats Anyone here make a 7-300 PRC

Any of you guys play with making a 7-300 prc yet. Just necking down 300 prc brass to 7mm. Basically a longer 7mm prc. Dimensionally everything should work. Mag box, feed rails bolt face etc.

Could you just ream a 7mm prc chamber deeper to the length and shoulder of a 300 PRC. Neck down 300 brass to 7mm. Would increase case volume increasing velocity.
If you have how did it work? Or what is your thoughts? Ken

I would think a 28 nosler would be easier but your project sounds fun. Good luck

How about a 358 PRC? RZ.

That would be a great round too.

That’s pretty much the 35 Newton. I used 375 Ruger cases to make mine. The Newton has a longer neck but generally about the same deal.

I know guys who have rifles in 7mm-300 PRC, but they built them with new custom barrels, however I don’t see why you couldn’t rechamber an existing 7mm PRC barrel with a reamer.

That’s my thoughts as well. I already have a couple 7mm Rem mags. How are they performing. I guess I’m curious on the average gain in velocity

I had a 7-300Win. The 300Win and the 300PRC have pretty much the same case volume. I decided it wasn’t worth the effort or expense compared to a 7RM with a long throat. After using the 7-300Win and the long 7RM for about 15 years I decided I preferred a 270 or 280 or 284 for hunting. I did go through 3 or 4 of the 7mm barrels testing etc. More recoil and effort for no substantial gain.

Forgot. The velocity gain was maybe 100fps compared to the standard 7RM.

Projectile selection,is going to do wayyyyyy more than cartridge selection. Hint.

A 7mm RemMag in a 700,with .796 BC 180's at 2900fps+,frosts all nicely and with aplomb,less ANY bullschit. I like mine kissing at 3.585",whether 280,280AI or 7mm RemMag. Hint.

Just sayin'.................

They built their rifles with a very specific purpose, to shoot high BC bullets out of a long barrel with a very fast twist. For them the marginal gain in FPS was worth the extra work and expense. And they like the fact they can neck down Lapua brass. Personally, I would not due it, especially in a rifle with a sporter barrel. Like others said, maybe 100 fps or so gain in standard length barrel. But if you happen to be a machinist and like the idea, go for it.

It’s a Christensen 24” carbon fiber barrel. For 100 fps I’ll just leave it as is. I have plenty of 300 prc brass in ADG and Lapua. That’s why I was thinking of reaming the chamber deeper. Then I compound another problem with dies. Glad I asked. You have to know both sides to make a good decision. Thanks Ken

I'm finding a new liking for the 28 nosler now that I'm not pushing it to max. I usually find consisentcy at close to max and was running 180s at 3200 fps with rl33. I've been trying some slower loads with retumbo and h1000 and 180s at around 3050fps. Brass life is great and it's still hot enough I'm getting consistency and a clean burn and the then 180s at 3050 are enough.

I thought the 28 was going to be the greatest thing ever when it first came out but lost a little interest in it after trying to run it at 3200. I'm really liking it better now that I'm not leaning on it too hard and it still outperforms most 7s and fits in most long actions with room to spare. I also like my 7 prc a lot but I'm only running 180s at 2850 from its 22" barrel. I've had it close to 2950 but that was pushing it hard. Maybe a 7-300prc would do what Hornady says the 7prc will do but without having to run it so hard. I do like the 375 ruger case better than the ultramarine because the body isn't wider than the rim. The downside to the 300 prc is its almost too long for a rem action.

Bb

Seems like a lot of work for minimal gains over the "standard" 7PRC, especially when a 28 Nosler already exists. Mine does 3200 with 180s all day.