Rollins wrote:...snip...
In the package and online it has a warning to only use their data for reloads as they are supposedly different than other bullets.
Thank you Litigation Attorneys File that right above the Proposition 65 warning.
Reloaders start with attorney approved recipes and experiment up from there. Unfortunately, some reloaders are obsessed with pushing their velocity up to just below detonating the rifle,
on the first try! That warning seeks to indemnify Speer from those who the gene pool struggles so valiantly to eliminate.
When the 450b first took off and for years to follow, it was only manufactured in the AR platform, with one bore ID and twist rate. That is unless you went custom, which few did. Sharing reload "Range Reports" was easy in those early years. Yes there were still
speed demons but most of us went along with the creedo: "Move slow, check often" when developing recipes.
When the stronger bolt actions and single shots arrived on the scene, the rules changed. Now we have two reloading philosophies to satisfy and what is safe in the latter, is not necessarily safe in the original platform, for what should be obvious reasons. Also back then, there were few recipes published by manufacturers. As the caliber matures, more and more reloading manuals are listing loads for it, though they still err on the side of conservative.
I would not hesitate to take those 300gr Deepcurls up to 2100-2200 fps in my 20" 1:24 twist AR upper. I would not go with Lil Gun however. That weight of bullet and above, is better served with the next slower powders.
Hoot