There are often unseen or unmeasurable variables at play, that will have huge effects on pressure.223 Remington 55 gr SP Frontier ® Item #FR120 20/Box American made and built on tradition – these are the hallmarks of Frontier® Cartridge. There is a reason we always harp on having the right data for the components being used. Reloaders need hard copies with complete data. It's always compromised in some way: A limited powder selection. But none of them publish the full data set for anything. There are very few companies that don't have online data. Ram Shot will send you a reloading guide for free.Īccurate will send you a reloading guide for free. It explains all of the abbreviations terminology and has notes about special risks with certain bullets, powders, primers, or reduced charges (that you won't see online).Īlliant will send you a reloading guide for free. If you're going to use Hodgdon data, you need to know what it means. That difference in jacket thickness makes the Sierra show pressure signs at what Speer considers 0.2gr over a starting load.Īnd, yes - "SPR SP" is "Speer Soft Point". The jackets are different thicknesses, even though the bullets look identical on the outside. I also can't use the Sierra bullets with Speer data. The pressure curve changes, and I get pressure signs on what Hornady considers a starting load for their bullets. However, I cannot use the Hornady data for the Winchester or Remington bullets. I can load the V-Max with the same data I use for the Hornady FMJ and SP - as long as I work up from the starting load. I have a large quantity of Winchester and Hornady 55gr FMJs and even more Remington, Sierra, Speer, Winchester, and Hornady 55gr SPs - with some 55gr V-Maxes thrown in. If some one were to assume that the similar shape, and same weight bullets could use the other bullet's data - the SFIRE's reloader would be starting with a powder charge over the published maximum. The data from this thread even works as an example: Sometimes, with completely unexpected results. Just think about all the posts we see in this forum, on a weekly basis that begin as a technical question, but quickly reveal that the reloader doesn't even know the basics of reloading, let alone the safety risks inherent to what they want to try.ĭifferent bullets react to pressure in different ways. But old reloaders know that starting with the minimum load and working up while looking for pressure signs is a safe procedure AS LONG AS THE BULLET WEIGHTS ARE THE SAME.Įven with your previous statement about a similar profile, that's not good advice to be making with a blanket statement.
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