[i][/i]To keep it short: acquired a rem mod 721 that Was chambered in 300 H&H mag, it is now in 300 win mag. The question; would a smith just ream out the chamber leaving a long throat? Or do you think the barrel was removed and the threads cut back some and reinstalled? The barrel is still 26” long.

Shoot it, the brass should fire form and you can look it over and tell maybe. Compare to a factory load.

barrel should have been cut back, thee 300 winny is fatteer at the shoulder than thee 300 H&H, and is shorter.

The previous owner should be jailed. I have a 721 in 300 H&H and it is one of my favorite rifles and calibers.

X2.

I hear yuh! But for $100 with a vortex scope on it? Why not?

3 different boxes of factory ammo only produced 1.5-2” groups at a 100 yds.

best and safest way would be make a chamber cast, you will know for sure then

Thought about doing that as well.

I do have dies, and thought about seating a bullet far enough out of the neck till I contact the rifling.

I have a suspicion that this rifle has a long throat and will take reloading with 200-220 gr bullets to be accurate.

Certainly wouldn't hurt to have someone with gages check the head space.

Cotton's suggestion would also be valuable.