Use up to date data, the IMR powders are not the same as they used to be.  I'd recommend using Hodgdon's website.  Even their data is a bit old as they're using CUP rather than PSI.  Start low, work up.  You may or may not have feeding problems with the spitzers, might want to make a few dummy rounds to try your bullets first.  Nosler has some fairly recent 30-40 data too, no pressure data, but their loads wouldn't be above the SAAMI max.

coaspen wrote on Aug 31^st, 2017 at 7:30pm:

I have a 30" barrel rolling block. I get 2000 with the 220 using 35.0 gr of 4895, a load selected using Lyman's pressure tested data. This is about 33,000. At this pressure you will not get 2000 from 18". You will need closer to the full 40,000 for that. Lyman's data indicates 4895 or 4064 can get about 2000 from 18 at nearly 40,000, but I'd switch to 4350 or Reloder 19 to lower the pressure some.

Hornady's data is not pressure tested and dates to before 1973. It was, though, tested in an actual Krag military rifle. My rolling block has the modern SAAMI chamber, as does Lyman's data, so it's not an exact comparison. With 4895, Hornady was not comfortable going beyond 2000 for the 220 from 30", so you will not get it from 18". In their data, 4350 would be the better choice for your goal. (The most recent Hornady data is even milder. They chose to chop 100 fps from the the maximum across all powders, with no explanation given.)

You didn't state what is your fps goal with the 180 gr bullets.

The Remington 180gr factory loads churn up 2400fps.  I'm not sure what sort of powder they're using now a days.

I didn't note the shortness of your barrel.  I don't imagine slower powders would be much help then.  I have a short barreled 30-06 that's a real boomer if you load it with 4350 or slower powder.  Nice fireball towards evening too!

Lyman's data indicates 4895 will give you the lowest pressures. Their data was shot in the standard 24" barrel, and you'll loose 100-150 fps in your barrel. For 180 at 2265 from 18", every powder they tested looks as if it will stay below SAAMI's recommended pressure. I'd use 4895 or maybe even 3031. They didn't test 760, but older pressure tested data from Winchester indicates it would also do the job for you.

I load Hornady #30396 160gr FTX  for the 308 Marlin express. At 3.145" OAL they feed like greased sausages in my 1899 vintage Krag.

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I marked the last of bullets loaded into the magazine with a fine tip sharpie at the mouth of the case. After firing 4 rounds and feeding the marked cartridge, it had not dislodged. the fine black line was still right were it started.