I know there already is one in the Spell Compendium. I hate it. I think +10 for the whole encounter is way too powerful, and makes a BBEG's SR into a joke. Turns a challenging encounter into a cake walk. But I do like the idea of extra help overcoming SR for particularly powerful foes. I'm not ashamed to say I was inspired by the idea of Assay Spell Resistance (Spell Compendium), but I think this makes for a more manageable spell.
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Precision Casting
School: Divination
Level: bard 3, cleric 3, druid 3, sorcerer 3, wizard 3
Casting Time: 1 swift action
Components: V, F
Range: Personal
Target: You
Duration: 1 round
Saving Throw: None; Spell Resistance: No
When casting precision casting, you focus your magical energies to make your spells more effective. This spell helps you penetrate the magical defenses of a target. After casting this spell, any other spell you cast for the duration of precision casting allows you to add your spellcasting ability score modifier to any caster level check you make to overcome spell resistance. If you are capable of casting multiple spells during the duration of precision casting, the bonus applies to each of them.
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Any thoughts? Is it still too powerful? Is the wording ambiguous or unclear? Can you break it?
How about using power components to help give boosts to getting around spell resistance.
Either raise the spell level by 1 (as per Assay SR) or give it a expensive material component around 100/150 gps and maybe, you could raise duration to 1 rnd/4 lvls.-
Material component examples: Dragon scales, or your favorite antimagic beast remains (Golem remains, or some other antimagic creature bodypart xD).
In the AD&D 2E Tome of Magic (I think, it's been a while) there is a spell called Lower Spell Resistance. Might give you some ideas.
I know there is also a 3.5 version in the Draconomicon, but that's probably the same one as in the Spell Compendium.
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Give it a fixed bonus, or it will be quite problematic the bump in power of the spell as pc level up.
Make it castable as a swift action if you dont then you hurt the action economy of the caster too much, and is only usable against targets that could´t be harmed otherwise, wich is quite rare so unless pc are expecting a BBEG they will never bother to memorize it.
Level 3 has it´s pros, it´s obviusly a spell mainly for high level play when creatures with SR are more common so a spell of 3 level could help to give some options for low level spell slots, I would put it 4 level nevertheless since 3 level is quite crowded (fly,protection from energy).
Hope that helps.