Thread: Beginner question: Using pistol projectile for 7.62x54r?

I think M-H is on the money - those lead bullets are probably expecting to see 1600 fps. With a generous burn of 2208 youre probably spraying near-molten lead out the end of the mosin at 3000 fps. Trying to find a load to run a lightweight cast bullet from a large case like the x54R that groups well AND is safe and reliable will be quite experimental. Also might pay to check your barrel for lead fouling too.
Trying to reduce youre rifle powder loads low enough is risky and not recomemmended - risk of weird effects and/or bullets stuck in bore. ADI say only AR2206H is suitable for reduced loads, check their website, but that may still be too much. So if if you want to persist with those projectiles, youre going to need to run light loads of fast burning pistol powder or trailboss (also fast burning but bulky, so you dont end up with a case 60-70% empty space).

This is worth a read, while not directly applicable to your situation it does give some reference point to extrapolate from.
https://www.hensleygibbs.com/edharri...The%20Load.htm

Other thoughts re difficult chambering
- check the overall length of your brass. If is grown a little and the cases are overlength it may become hard to chamber.
- one of my mosins had a chamber that wouldnt rechamber its own fired cases immediately afterwards, i think it was out of round or asymmetrical somehow.
- bullet touching lands - although you seem to have already checked freebore.