I was playing around with a recoil calculator and noticed a difference of 17 gn of powder used to get approximately the same velocity.
And wondered if the difference of 5 FP @ 1 FPS in calculated recoil could really be felt or noticed?
Would the differences in burning rates make any difference in the felt recoil?

It was the 404 Jeffery with 400 gn bullets in this case.

These first 4 for loads were posted by Reed and fired in the same rifle and I think on the same day.

85 gn of IMR 4831 got 2237 fps = 47 FP @ 17 FPS recoil

87 gn of H 4831 SC got 2214 fps = 47 FP @ 17 FPS

75 gn of IMR 4064 got 2237 fps = 44 FP @ 16 FPS

72 gn of IMR 4064 got 2217 fps = 43 FP @ 16 FPS

And someone else's load:

70 gn of Reloader 15 got 2209 fps = 42 FP @ 16 FPS

Allen

Yes you can feel the difference in 15 grains of powder.

I would expect the burn rate to affect the recoil as well ie. faster powder vs. slower powder. I don't know which of the powders quoted are faster or slower.
Peter.

quote:

Originally posted by ramrod340:
Yes you can feel the difference in 15 grains of powder.

It's a very rare day that I disagree with Ramrod.....BUT...on a 400 grain 404 Jeffery that can produce substantial recoil....(been there.....done that) about the only way one is going to notice is if there is a substantial change in bullet weight or a substantial change in velocity.... and the premise is that neither is changed.....yes at least theoretically the lesser powder charge is equivalent to a reduced "ejecta" weight..(the total mass ejected by the firing of the round) but, while I've never done this test, it'd be very surprising if a shooter could actually detect the small difference....I have nothing to support my opinion....just my gut feeling.....and I'm sticking to it!

It would take a finely calibrated shoulder to detect any such difference.

In other words, not likely!

quote:

It's a very rare day that I disagree with Ramrod.....BUT...on a 400 grain 404 Jeffery that can produce substantial recoil....(

You may be 100% correct. Maybe the recoil on the Jeffery overpowers the difference or maybe the recoil speed change is easier felt. I have no first hand knowledge with the Jeffery.

What I was basing my comment on was a 6.5# 338Wmag I built once. With it there was anoticable difference with powder charge and burnrate. Comparing the numbers the velocity of it recoil was 21-24fps depending on burnrate and charge weight.

Easiest sure way to tell is load both and try.

Ramrod....I don't have any serious bruisers like the 505 Gibbs or 458 Lott et al.....but I have two big bores....both shoot 400 grain bullets at 2400 FPS.....and I have no desire for additional recoil...the 404 Jeff and the 416 Ruger supply all I want.....and I'm not sure why I have them any more.....as the .375 rifles I own can do anything I want done!

Both the 416 and 404 would have to be tamed significantly to allow me to shoot them comfortably...and yes as I said....I'm guessing.....but the net effect is a reduction of 15 grains of matter flowing out the barrel....I actually can barely feel the difference in a 180 verses a 165 30-06 load let alone something that is measured on the richter scale.....