Nothing over 168 grain and 150 was toyed around with in vintage days.
Your rifle will be fine.
Now if you had a sweet New M1A Springfield you could shoot whatever you want.
I ran 4,000 round of So. Africa, Argentine, Nato, etc and even those stell cassing Russian stuff before I cleaned it.
No problemo and WILL be the gun I grab in SHTF.
You must not have read what Phil Sharp, Julian Hatcher and George Nonte had to say about using the 200-grain bullet from the .30-40 Krag in .30-06 loads for the Garand. It worked pretty well in a Springfield or BAR [or the .30-06 Colombian Mauser I was shooting quite a bit in those days] but was a bit hard on Garands. Which was not a big deal up until the 1970s, when the cheerful armourers at Camp Perry would happily direct exchange a bent M1 op rod for a brand-new in-the-wrap one during the national matches. But the parts stocks that allowed that, like those days, are now long gone.
Not according to the M1A manual from Springfield Armory:
The M1A is designed and built to specifications to shoot standard factory military 7.62 NATO ammunition. The specifications for standard military ammunition include harder primers to withstand the slight indentation from the firing pin when the bolt chambers a cartridge. This slight indentation is normal. The use of civilian ammunition with more sensitive primers or handloads with commercial primers and/or improperly seated primers increase the risk of primer detonation when the bolt slams forward. This unexpected "slam fire" can occur even if the trigger is not being pulled and if the safety is on. Use of military specification ammunition will help avoid this. Every shooter should use extreme caution when loading this or any other firearm. See page 15 for instructions on proper loading to help avoid a "slam fire". Also see enclosed article on “Slam Fire” written by Wayne Faatz.
Use only recently made high quality, original military or factory-manufactured ammunition of 7.62 caliber. Old ammunition may deteriorate from age causing it to be dangerous. Do not use cartridges that are dirty, wet, corroded, bent or damaged. Do not oil cartridges. Do not spray aerosol-type lubricants, preservatives or cleaners directly onto cartridges or where excess spray may flow into contact with cartridges. Defective ammunition is the primary cause of mishaps and can cause injury or death to you and bystanders.
Lubricant or other foreign matter on cartridges can cause potentially dangerous ammunition malfunctions. Store ammunition in a cool dry place to prevent contamination and deterioration of the primer and powder. Use only ammunition of the caliber for which your firearm is chambered. The proper caliber is permanently engraved on your firearm; never attempt to use ammunition of any other caliber. Defective ammunition can create excessive pressures resulting in an explosion and cause injury or death to you and/or those nearby. You must assume responsibility for using proper and safe ammunition.
,br> Keep ammunition separated by caliber at home and on the range. This can be done by keeping it in the original box. Throw ammunition away that has been dented or deformed, shows signs of wear such as split or cracked necks, cratered or flattened primers, or punctured cases. If you have any reason to question the safety of any cartridge do not use it and safely discard it immediately.
DO NOT UNDER ANY CIRCUMSTANCES USE OLD OR RELOADED AMMUNITION PURCHASED AT GUN SHOWS, ESTATE SALES OR AUCTIONS. WARNING - Springfield Armory M1A user's manual