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blackhawk8,
Looks like you are between a rock and a hard place.
If I were you, I would suggest to you cousin a change of power or bullet. The provided powder and bullet just don't play well together.
I'm sure that a working load couldn't be had, but it is not going to be even close to being what I would want and expect from the round or rifle.
I load a powder-puff 240gr LSW using 231 (same as HP-38). My 6 and 8 year old grand daughters like to shoot it a pistol. But, you have 300gr bullets, I think they are jacketed.
H110/296 has what I view as a small window of charge for pressure. LitGun could be an alternative. 2400 would be my first choice with those 300s. But, you have HP-38 powder....
Sorry, but I don't think I have a resolution to your quandary.
Be safe,
OSOK
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