Ok, good info on bullet selection. In your first post I read lead bullets and incorrectly assumed cast. Apologies.
This is what I do to achieve what you are after.
1. Find the printed ballistic coefficient for each bullet.
2. Start simple by using the same powder for both bullets. Use the slowest burning powder you have or can get that fills the case to about 90% (to the bottom of the shoulder, some manuals list % fill) for the bullet with the smaller number ballistic coefficient.
3. For the bullet with the higher ballistic coefficient, reduce the charge by a couple grains. You have to slow the slippery bullet some.
This should get you close for the two bullets.
A ballistic calculator, like this free one, can help you get started.
http://www.shooterscalculator.com/ballistic-trajectory-chart.php
Your Example, please work through this yourself to check my work.
Your 243 Nosler E tip 90gr lists a G1 ballistic coefficient of 0.403. Your 243 Nosier 90 gr Ballistic tip lists at 0.365. Hodgdon website (
http://www.hodgdonreloading.com/data/rifle) lists H4350 max load for 243 at 44.5 gr for 90 grain bullet.
I’d start by loading the 90 grain ballistic tip lead core with 44 gr powder for a guess 3125 fps and the 90 gr E tip non-lead at 42 gr H4350 for a guess 3075 fps. Putting the muzzle velocities and ballistic coefficients into the ballistic calculator, you can see they follow roughly the same trajectory, which is what I think you are after (screen shots below). Play with the charge weight, example, from 42gr to 39.8gr on the E tip load and/or 44gr to 44.2gr on ballistic tip load to dial them in. Once your point of impacts are close, play with powder types, primer brands and OAL to shrink group sizes for both.
Other people on this site have better software tools to give less of a guess muzzle velocity, maybe they can jump in and help more. If you tell us what powder you plan to use, even better.
Technically, both bullets won’t be same exact point of impact, so other people’s comments are correct.(
@Grumulkin,
@Varminterror)
For example, once you have each bullet shooting 1 inch groups at 100 yards, you still may not be able to shoot 3 E tips and 2 Ballistic tips in a 5 shot string and expect a 1 inch group. But still close enough to practice, right?
Once you do this work, you will never go back to anything else, probably. I used to shoot all kinds of different loads in 7 mm Rem mag. Now I only shoot 175gr gamekings and 175gr ELD-X because I’ve dialed them in for 0-600 yards in my rifle, and I can switch between the two without scope adjustments and hit with confidence.
Whew! Long post, I hope you find it was worth it. This is hand loading “hard work”, but once you understand how to do this, you will be a top hand loader, in my humble opinion.
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