I am trying to load a 300 gr. cast bullet to about 900 fps for use in my 629. From my manuals it looks like something close to 14.5 gr of 2400 will do that, with 15.7 gr being maximum. 2400 is the only powder I have that is listed for a 300 gr bullet in my manuals.

I ordered a sample pack of 300gr coated cast bullets from Missouri Bullet Co and the two options for a crimping groove leave me with an overall cartridge length of + 1.900 and one of 1.615.

The first will not fit in my cylinder ( I wonder what gun could handle that length) and the second is below the minimum OAL in my manuals, which is 1.665 (Alliant Powder) and 1.710 (Lyman).

I believe those minimum OAL numbers are for a max charge. My question is whether my intended load would be safe given the fact that it is more than a grain under max. I would start at a minimum charge of 14.o grains and work up slowly but perhaps it is too risky to even try that.

Any one have a manual that shows an allowable OAL as short as 1.615?