Has anyone developed loads using a 300 gr pill in their 450-400?

I shoot both 300 and 400 grain bullets in my .405 DR.
It was regulated by Aaron Litle with 300 grain and if you are interested, I will check my records. If I remember correctly, the 300 grain loads regulated at around 2250 and the 400 around 2100 fps.

Cr,
Thanks for posting,I am looking for the speeds you are getting,but your load data wont work in the 450-400

Hello Bill,

I have used the 300gr Hornady bullet over 80 grs of IMR 4831 in several of my 450-400 3" and 3 1/4" doubles and got the same POI as the 400gr bullets. Makes a great practice / hog load.

If I recall I was getting 2250 to 2300fps or so with the 300s.

I have been able to use that same 75% rule in my 470 and my 500/450.

I've sold off all my doubles now except for the 470 Evans and the Holland Paradox so it's been a while since I shot that load but I recall it was very pleasant to shoot out of a 9.5 to 10lb gun.

Jim,
Exactly what I was looking for,thanks.

Bill, hope you are well. Miss our DRSS shoots! I've used 61-63 grains of RL15 and filler with 300 grain Hornady flat points and spire points. Also for a plinker and deer/hog load 36-37 grains 5744 and same bullets (as well as some cast 300's with no filler. Bob

Thanks for posting,am well wish you the same,the DRSS shoots were a great time,sorely missed .
Appreciate the data.

The 75% rule generally works, or at worst givew you a place to start...Since I only use my doubles to shoot DG as a rule I never bother and besides the heavy bullets have shot better in all cases best I recall and I also don't like messing with a double once I have it tuned to perfection with the 400 gr. bullets in my favored caliber the 450-400s. I play with the bolt guns in such cases..