![]() The pressures developed by this cartridge were mild at 14,000 PSI Maximum Average Pressure. The original 45 Colt cartridge was developed almost 150 years ago. We do not manufacture this level of ammunition at this time. The third level pushes the pressures up to 50,000 CUP. This can only be used in the above listed firearms. The second level can reach up to 40,000 CUP which far exceeds the SAAMI limit. This is safe for vintage trapdoor and replica firearms when no other information is available. The first level is up to the actual SAAMI limit of 28,000 CUP. This is a CYA response as +P (plus pressure) would by definition exceed SAAMI MAXIMUM average pressure of 28,000 CUP.īecause there are modern firearms that can safely shoot more powerful ammunition than the SAAMI limits, the firearm/ammunition industry has recognized three levels of ammunition for the 45-70. One of the manufacturer’s responses we have seen (and received ourselves) is that +P is safe as long as it is within SAAMI pressure specs. If a firearm manufacturer goes on record stating their firearm can safely use +P ammunition we will add that model to our list. That is a determination that only the firearm manufacturer can make. Unfortunately, we do not have any information about the suitability and safety of using +P ammunition in any other firearms. ![]() We get a lot of inquiries about firearms not listed. Keep in mind that some lever action firearms may have problems with loading and/or feeding cartridges using the longer heavier bullets in the more powerful ammunition. ![]() It also is officially a low pressure round and only select firearms are capable of handling the pressures of modern +P ammunition including our Bear Load.įirearms capable of shooting our 45-70 +P ammunition: There are still many vintage and of course replica firearms available in this chambering. As with the 45 Colt, the 45-70 cartridge goes back a long way. ![]()
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