Recreating 7N1, some recommendations

[CarrieDe]

I've been trying to recreate 7N1 in ways more available than the original. I know I'm not going to get the mild steel tip, so what I need to make happen is find a similar weight and BC bullet to use. Specifically, my goal is make a load that aligns better with the BDC turret of the PSO (Which is calibrated for 7N1.) Does anyone have any projectiles to recommend? Thanks.

BC: Hard to find consistent numbers, but around .402
Sectional density: 0.226
Velocity: 2700 FPS

 

[MarshallDodge]

You need .220" diameter bullets, correct?

 

[CarrieDe]

You need .220" diameter bullets, correct?

No. That's 7N6 you're thinking of. This uses .311

 

[RegionRat]

7N1 = 7.62x54R Ammo
7N10 = 5.45x39 Ammo

7N1 is explained pretty well here.
https://en.wikipedia.org/wiki/7.62×54mmR

 

[MarshallDodge]

I'm not a fan of FMJ bullets for accuracy, but off the top of my head,, the only thing that comes close is the Hornady 174 FMJ

https://www.midsouthshooterssupply.com/item/000033131/303-caliber-point3105-dia-174-grain-fmj-bt-with-cannelure-100-count

 

[CarrieDe]

I'm not a fan of FMJ bullets for accuracy, but off the top of my head,, the only thing that comes close is the Hornady 174 FMJ

https://www.midsouthshooterssupply.com/item/000033131/303-caliber-point3105-dia-174-grain-fmj-bt-with-cannelure-100-count

I actually have used some of those, though I'm not sure about the performance. I wasn't having much luck at getting it to the right velocity either, critical for getting a similar arc to 7N1.

 

[Basic user]

I've been trying to recreate 7N1 in ways more available than the original. I know I'm not going to get the mild steel tip, so what I need to make happen is find a similar weight and BC bullet to use. Specifically, my goal is make a load that aligns better with the BDC turret of the PSO (Which is calibrated for 7N1.) Does anyone have any projectiles to recommend? Thanks.

BC: Hard to find consistent numbers, but around .402
Sectional density: 0.226
Velocity: 2700 FPS

I reload this caliber, and the bullet selection is very poor. You're probably not going to have much luck in that. Have you slugged your barrel just to be sure? I know most Privi has a 150gr bt bullet that's similar but, not sure of it's bc. The 7N1 projectile is a measured .402 g1 or a .216 G7. You could try to screw with privi's bullet and adjust the velocity to mimic the 7n1's flight path, or maybe find another projectile that has a closer bc and do the same thing.

 

[tekmann2377]

Hornady FMJ bullets actually tend to shoot OK for a bulk FMJ bullet. Not 0.5 MOA, but often times in the 1-1.5 MOA range.

That being said you mention having used these, but you don't know how they perform? Either they shoot well in your rifle or they don't?

If you want to replicate a specific load velocity I would use a single base stick powder as they tend to have fairly linear velocities compared to charge weight.

 

[tomme boy]

Does Sierra still make the 174gr HPBT Matchking? Thats the bullet I used to shoot if I wanted longer range accuracy. Or the Lapua D166 bullet

 

[JerkyFreak]

https://sierrabullets.com/303-cal-174-gr-hpbt-matchking-smk/

Claimed G1/G7 0.499/0.249

It works great in .303 Lee-Enfields. Still supersonic at 1000 even at a sedate 2400 fps MV.