any rule of thumb for same weights different brand X charge

WhelanLad

WhelanLad

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Do we think there is any comparisions here regarding the bullet weight with a proven loads charge, passed over to another "bullet" .....
example.

would you load your Pet load of **example** 54grains powder behind a " 130gr X SP" for your new 130gr Bullet "Y SP" ,
or do you completely drop to minimum an work back up--

Is that something a Rifle will do- or are there too many variables at play ?

i could see the work up needed if you are playing with Hotter loads- though i am curious to hear how you would go about it!
 
My 308 seems to like the same charge weight for 168 grain projectiles, the first three or four I did standard work ups and all seem to end up at the same place. the next couple projectiles I tried I went with the same charge weight after checking the books and it’s still happy. The last couple I’ve just used that charge weight and everything else stays the same brass,primers,powder type. If I change anything of those I would start again.
Now I get with that old guy at the range was talking about a couple years ago before I started reloading, he was like I used 43 grains of varget for everything! I just smiled and nodded my head as I didn’t even know what varget meant at the time lol ( I imagine he was using the same bullet weight)
As it turns out mines pretty similar and so far everything seems to like it, although it makes me feel kind of like Oprah sometimes…..you get 44.4 grains and you get 44.4 grains and you get 44.4 grains hehe
Edit:spelling
 
I would check the ogive length of the rounds and compare them. If they are really close I might load a few at the pet loads and see how it performs. If satisfactory, run with it.

If not you can play in a range slightly above, and slightly below to dial it back in. Usually quicker than starting all over again for the new bullet.
 
As with any component change you have to back off (not saying to start loads) and you may have to adjust seating length as well.

This should be a no brainer for a guy like yourself Whelan….. for a noobie it’s the type of question one expects.
 
I would back off a bit and test a few loads.
Even with the same weight and bearing length, there could be variations in jacket hardness.
 
WL, many manuals will list charges for bullet weights ranging up to 5 grains.

Now, this works fine for old school cup and core bullets, but when you start going to monolithics, H Mantle, or bullets with extended bodies, which have greater contact/friction surfaces in the bore then it's advisable to check the bullet manufacturer's manuals for charge weights.

Old school cup and core bullets pretty much have similar bore contact surfaces, when they are close in weight.

This doesn't hold true for ELD and similar bullets, even if they're a similar weight.

Considering the bullet weight you give, 130 grains, it's for your 270 Win, FWT.

If you are using Speer, Hornady, Sierra, Remington, or similar type cup and core bullets, your charge, as long as it's not close to or over maximum, could be a very good place to start.
 
in agreement with bearhunter on this one

for me it would depend on how hot the pet load is, I have a few loads that are near the edge, so those I would first loos to see how the new bullet is going to effect case fill based on seating depth. Change from flat base to boat tail, or a mono your going to need to back it off.

for loads that I know are mild and bullets are basically the same I will just try the pet load.
 
woodchopper said:
in agreement with bearhunter on this one

for me it would depend on how hot the pet load is, I have a few loads that are near the edge, so those I would first loos to see how the new bullet is going to effect case fill based on seating depth. Change from flat base to boat tail, or a mono your going to need to back it off.

for loads that I know are mild and bullets are basically the same I will just try the pet load.
Click to expand...

This. Hot load? Different bullet construction? Different bullet type? Start low and work up. Very similar bullet and the load is not on the spicy side? Id send it.
 
If you change bullet types (example: from cup & core to monometal) then start from scratch. Same if your load is at the top end of max. pressure. Otherwise use your own discretion, which is code for "hell yeah but whatever happens is on you."
 
yeah, nah - strictly speaking any correlation between the same cup an core soft point in the same weights-


i took a good look at the bearing surfaces and then seated them diferent to suit the gun an where i wanted the coal etc-

some guns like hot loads and some accurate at lower speed- is that a common theme or still too much bullet variable?
 
None of us have pressure testing strain guages, so I'm not sure anything we say is really worth anything. But back when I was working with 30-06 loads for five different rifles. I asked a guy who did. His answer was the standard cup and core were pretty interchangeable for a single rifle. I found the velocities then were comparable for the herd.

For every rule there is an exception. I picked up a P17 factory sporter as a canoe rifle. I loaded my standard 180gr load and got 300WM velocities ! WTF ! I backed off.
 
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